loongarch/kvm/timer.c

11  * ktime_to_tick() - Scale ktime_t to timer tick value.
27 enum hrtimer_restart kvm_swtimer_wakeup(struct hrtimer *timer)
31 	vcpu = container_of(timer, struct kvm_vcpu, arch.swtimer);
39  * Initialise the timer to the specified frequency, zero it
50  * Restore soft timer state from saved context.
60 	 * Set guest stable timer cfg csr
61 	 * Disable timer before restore estat CSR register, avoid to
62 	 * get invalid timer interrupt for old timer cfg
70 		/* Guest timer is disabled, just restore timer registers */
76 	 * Freeze the soft-timer and sync the guest stable timer with it.
83 	 * If oneshot timer is fired, CSR TVAL will be -1, there are two
85 	 *  1) timer is fired during exiting to host
86 	 *  2) timer is fired and vm is doing timer irq, and then exiting to
87 	 *     host. Host should not inject timer irq to avoid spurious
88 	 *     timer interrupt again
94 		 * Writing 0 to LOONGARCH_CSR_TVAL will inject timer irq
101 		 * timer interrupt, and CSR TVAL keeps unchanged with -1, it
102 		 * avoids spurious timer interrupt
123 		 * Inject timer here though sw timer should inject timer
124 		 * interrupt async already, since sw timer may be cancelled
134  * Save guest timer state and switch to software emulation of guest
135  * timer. The hard timer must already be in use, so preemption should be
149 	 * If period timer is fired, CSR TVAL will be reloaded from CSR TCFG
150 	 * If oneshot timer is fired, CSR TVAL will be -1
151 	 * Here judge one-shot timer fired by checking whether TVAL is larger
172  * Save guest timer state and switch to soft guest timer if hard timer was in
181 	/* Save hard timer state */
187 	/* Save timer-related state to vCPU context */